Ultra low profile, unbalanced fed inverted F antenna for 2.45 GHz wireless communication system

An ultra low profile unbalanced inverted antenna is proposed, which is analyzed numerically and its characteristics are compared with those ultra low profile inverted L antenna and conventional base fed inverted antenna then compared with its measured results. The design frequency is 2.45 GHz. When the size of conducting plane is 0.245 λ by 0.49 λ and antenna height is λ/20, the return loss bandwidth less than -10 dB becomes 3.67 % and the directive gain is 4.15 dBi. In the numerical analysis, the electromagnetic simulator “WIPL-D” based on the method of moment is used.